> Justin wrote:
> >
> >
> > aravind chandu wrote:
> > Hi,
> > >> My question is
> > >> Microsoft sql server 2005 cannot be shared on multiple systems
> > i,e in a network environment when it is installed in one system it
> > cannot be accessed one other systems.
> >
> >
> > This don't make any sense. Are your taking about sharing the actual
> > mdb files or access the service itself??? This question is just
> > confusing.
> >
> >
> > Your Questions are confusing can you clarify
> > I'm guessing at what you mean???
> He's talking about having the raw database files on a file server (eg
> SMB share). DB's like firebird and sqlite can handle this way of
> accessing the data using the embedded engines.
Active-active, multiple server databases are either a shared nothing or
a shared disk system. Oracle, for instance is a shared disk system
where multiple database instances can connect to the same underlying
disk. Greenplum, Teradata, and Netezza are examples of shared nothing
systems.
http://en.wikipedia.org/wiki/Shared_nothing_architecture
http://en.wikipedia.org/wiki/Shared_disk_file_system
PostgreSQL does not have either a shared disk or shared nothing
architecture. It is similar to SQL Server where replication and/or
failover is how you can get high availability.
http://www.postgresql.org/docs/8.3/interactive/high-availability.html
Greenplum and EnterpriseDB are both based on PostgreSQL and use a shared
nothing architecture to achieve and active-active system.
Jon